Flashcards in Work And Machines Deck (18):
In scientific terms, you do work any time you exert a force on an object that causes the object to move any distance.
When force is measured in newtons and distance in meters, the SI unit of work is the newton-meter. This unit is also called joule.
Power is the rate at which work is done.
One joule of one work done is one second is one Watt of power.
Machines are devices that allow you to work in an easier way.
When you do the work, the force you exert is called input force.
The machine exerts the output force over the output distance.
A machine’s mechanical advantage is a number of times a machine increases a force exerted on it.
The efficiency of a machine compares output work to the input work.
A simple machine is the most basic device for making work easier.
An inclined plane is a flat, slope surface.
A wedge is a device that is thick at one end and tapers to a thin edge at the other end.
Like a wedge, a screw is a simple machine that is related to the inclined plane.
A lever is a rigid bar is free to pivot, or rotate, on a fixed force.
The fixed point that a lever pivots around is called the fulcrum.
A pulley is a simple machine made of grooved wheel with a rope or cable wrapped around it.
Wheel and axle
A simple machine made of two connected objects that rotate in a common axis is called wheel axle.